Adjustable crown block



June 15 1926.

B. BOYKIN, JR

ADJUSTABLE CROWN BLOCK 2 Sheets-Sheet 1 Filed D520. 27, 1924 WWW June 15 1926. 1,588,872

B. BOYKIN, JR

ADJUSTABLE CROWN BLOCK Filed Dec. 27, 1924 2 Sheets-Sheet 2 Patented June 15, 1926.

BURWELL BOYKI N', 33., 01 BEAUMONT, TEXAS.

I ADJUSTABLE CROWN BLOCK.

Application filed December 27, 1924. Serial No. 758,355.

My invention relates to crown blocks for use 1n pumping operat10ns.-

In the operations concerned with well drilling and pumping, the tools and apparatus are raised and lowered in the well hole by a hoisting apparatus vincluding a cable running from the hoisting drum up over the crown block at the upper end of the derrick" and back to the well.- -It .is n cessary for most effective operations tha the crown block be adjusted so that the travelling block or the tool engaging end of the cable be suspended directly above the well hole. This is not possible of accomplishment with some type of derrick equipment as now used. It is an object of the invention to provide a crown block in which the cable supporting elements are capable of adjustment as desired. 1

It is also an object to provide a crown block which is strong and durable and can be cheaply and economically constructed and quickly installed. 4

Further objects and advantages will appear from the description which follows:

Referring to the drawing herewith, Fig. 1 is a side elevation of a crown block embody- 1ng my invention. Fig. 2 is a broken top elevation thereof, and Fig. 3 is an end elevation of the invention, a portion thereof being broken away in central vertical section of one of the bearings. Like numerals of reference designate like parts in all the views.

In the construction of the crown block 'I employ a plurality of parallel beams which are preferably of the I beam form uniformly spaced apart so-as to furnish supports between ad acent beams for the bearing shafts of the pulleys. The two outer I-beams 1 are shown as being somewhat shorter than the two central I beams 2. The said beams are spaced apart at their ends by approximately rectangular plates 3, said plates having recesses or notches 4.- cut in their upper edges to provide space for the bearin clamps which will be later described. T e beams are held in spaced relation against the said lates 3 by means of transverse bolts 5 and 6.

he said bolts -5 secure the two central 1- beams 1 together and are passed throu h the said beams beyond the ends of the si e beams 1. The bolts 6 extend transversely through all thebeams and are ti htened-in position by means of nuts on t eirouter ends in the usual, manner.

The sheaves or pulleys 6 are of the ordinary construction having an outer grooved periphery 7 to receive the cable and are secured upon a bearing shaft 8 which extends laterally from each side of said pulleys.

The shafts 8 have their bearm s within bearing boxes 9 which are recesse slightly at 10 on their lower faces to fit slidably upon the upper faces of the I-beams. The blocks are approximately rectangular in shape on theirouter faces, and are recessed to provide a chamber 11 which receives the bushings 12 shaped to fit about the shaft 8 and having wearing surfaces 13 of Babbitt or other bearing metal. The upper ends of the chambers 11 of the bearing are closed by means of a cap 14. Said cap has a central opening 15 therein which is closed by means of a cover or gate 16 hinged at its inner end at 1'. to upwardly extending lugs 18 upon the body of the cap.

Both the bearing box and the caps are formed with laterally extending lugs 19 and 20, respectively, on each of their ends. These lugs are formed with openingsto receive boltsor pins 21 and as will be noted in the drawing, are adapted to register with each other so that one bolt on each end will secure both the box and the cap in position.

The said bolts 21 are secured at their lower ends within'clamps 22. The shape of these clamps is best seen in Fig. 3. They are flattened at their lower faces tofit upon the I-beams and have their ends formed with hooks 23 to engage about the sides of the I-beams. The clamps are thus slidable over [the ends of the beams and along the upper sides thereof to an desired position. The bolt 21 has a head tting within a square recess in the lower face of the clamp, thus preventing its rotation. Nuts 24 are placed u on the said bolts above the lugs 19 of t e boxes, and similar nuts 25 are placed on said bolts above the lugs 20 of the caps. It will thus be obvious that when the boxes have been adjusted along the beams to the xes so as to desired point, the nuts 24km be tightened i It Wlll be noted that by means of this type of bearing for the pulley blocks the position of the pulleys upon the beams may be adjusted, and if desired, again changed to any point along the beams. It is possible also to change the number of pulleys upon the beams by spacing them in any manner desired. The crown block is easily and economically assembled and the pulleys and their bearings also easily positioned and adjusted at any desired point. These features of construction are of great value in the art.

Having thus described my invention, what I claim as new and desire to protect by Letters Patent is:

1. In a crown block, the combination of a shaft, a supporting I-beam, a bearing box for said shaft on said beam, a longitudinally extending lug on each end of said box centrally of said beam, a cap on said box having lugs thereon above said box lugs, a separate clamping plate at each end of said-box, said plate having hooked ends slidably engaging and extending upwardly through said lugsat each end of said box, and nuts on said bolts securing said lugs thereon and nuts clamping said box to said beam.

' In testimony whereof I hereunto aflix my signature this 22nd day of December, A. D.

' BURWELL BOYKIN, JR. 

